JP2011186364A - Image display system, image display device and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation easy even for a user unfamiliar to machine operation. <P>SOLUTION: A projector and a document camera are directly connected via a USB interface. The projector is equipped with: an input source changing section for changing input sources of an image to be displayed; a communication establishing section (S110, S120) which establishes a communication path by the USB interface; and a changing control section (S160, S170) for changing the input source to an image signal supplying device, by controlling the input source changing section, in response to the fact that communication is established by the communication establishing section. Then, stream negotiation is performed (Step S190, S240), and transmitting and receiving of the stream from the document camera to the projector 10 are performed (Step S250, S192). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image display system including an image signal supply device and an image display device, and an image display device.

  In recent years, using a projector and a document camera to project an image captured by the document camera with a projector has been effectively used in presentations and the like. As one of these image display systems, a document camera and a projector are connected to a computer, and when the document camera is turned on, the computer controls the projector by taking a picture by controlling the document camera. Thus, a configuration for projecting an image obtained by photographing is proposed (Patent Document 1). According to this configuration, the document can be automatically projected when the power of the document camera is turned on (Patent Document 1).

JP 2005-79730 A

  However, in the above conventional technique, since a computer is interposed between the projector and the document camera, there is a problem that a computer operation is required, and a user who is not familiar with the machine operation cannot easily operate the computer. .

  The present invention has been made to solve the above-described conventional problems, and an object thereof is to enable a simple operation even for a user who is unfamiliar with machine operation.

  In order to solve at least a part of the above problems, the present invention can be realized as the following forms or application examples.

  Application Example 1 In an image display system that causes an image display device to display an image based on an image signal supplied from an image signal supply device, the image display device displays an image based on the image signal; An input source switching unit that switches an input source of an image signal representing an image to be displayed on the image display unit, a communication establishment unit that establishes a communication path with the image signal supply device, and the communication path is established by the communication establishment unit In response, the switching control unit that controls the input source switching unit to switch the input source to the image signal supply device, and the image reception unit that receives the image signal supplied from the image signal supply device; And the image signal supply device transmits the image signal via the communication path after the input control is switched by the switching control unit. And an image transmission unit that transmits to the image display device, image display system.

  In the image display system described in Application Example 1, when a communication path is established between the image signal supply device and the image display device, the image display device automatically supplies the input source with the image signal by the switching control unit. Switch to device. Thereafter, an image is transmitted from the image signal supply device by the image transmission unit, and the image display device receives the image transmitted from the image reception unit. Therefore, the user can easily display the image obtained by the image signal supply device on the image display device simply by connecting the image signal supply device and the image display device using a predetermined transmission cable.

  Application Example 2 In the image display system according to the application example, each of the image signal supply device and the image display device includes a USB interface, and the communication establishment unit communicates with the image signal supply device. A USB connection detection unit that detects a connection via the USB interface, and a configuration setting unit that acquires a configuration descriptor of the image signal supply device, and the image display device further includes the configuration setting An image display system comprising: a stream negotiation unit that determines conditions for transmitting and receiving the image based on a configuration descriptor acquired by the unit.

  Since each of the image display systems described in Application Example 2 includes a USB interface, the USB standard can be achieved by simply connecting the image signal supply device and the image display device using a USB cable as a predetermined transmission cable. Accordingly, the conditions for transmitting and receiving the image can be determined based on the configuration descriptor acquired by the configuration setting unit, which is highly convenient.

  Application Example 3 In the image display system according to the application example described above, the configuration descriptor includes at least type data for defining a color space of an image obtained by the image signal supply device, and the image descriptor A display apparatus is an image display system provided with the image color correction part which performs color correction of the image received in the said image receiving part based on the said kind data.

  In the image display system described in Application Example 3, the image obtained by the image signal supply device is color-corrected so that it can be faithfully reproduced within the color gamut of the image display device. Therefore, the image display system described in Application Example 3 is excellent in color reproducibility.

  Application Example 4 In the image display system according to the application example, the image display device is configured to switch the input source by the switching control unit after the communication path is established by the communication establishment unit. A standby state determination unit that determines whether or not the image display device is in a standby state, and when the standby state is determined by the standby state determination unit, the image display device is switched from the standby state to the on state. An image display system comprising an activation unit for switching.

  In the image display system according to the application example 4, after the communication path is established between the image signal supply device and the image display device, the image display device is automatically switched to the on state when the image display device is in the standby state. Therefore, the image obtained by the image signal supply device can be reliably displayed on the image display device.

  Application Example 5 In an image display device that displays an image based on an image signal supplied from an image signal supply device, an input source switching unit that switches an input source of an image to be displayed, and communication that establishes a communication path using the USB interface An image display device comprising: an establishing unit; and a switching control unit that controls the input source switching unit to switch the input source to the image signal supply device in response to the establishment of the communication path by the communication establishing unit .

  In the image display device described in Application Example 5, when a communication path is established with the image signal supply device, the input source is automatically switched to the image signal supply device by the switching control unit. Therefore, similarly to the image display system described in Application Example 1, the user simply connects the image signal supply device and the image display device, and the image obtained by the image signal supply device can be easily displayed on the image display device. Can be displayed.

  As an image display device according to another application example, the components of the image display system according to any one of application examples 2 to 4 may be added to the image display device according to application example 5.

  Application Example 6 The image display device according to the application example described above, further including a USB interface connected to the image signal supply device, wherein the communication establishment unit communicates with the image signal supply device. A USB connection detection unit for detecting a connection via the network and a configuration setting unit for acquiring a configuration descriptor scripter of the image signal supply device, and further based on the configuration descriptor scripter acquired by the configuration setting unit It is preferable that a stream negotiation unit for determining a condition for transmitting and receiving the image is provided.

  Application Example 7 In the image display device according to the application example described above, the configuration descriptor scripter includes at least type data for defining a color space of an image obtained by the image signal supply device, and the type It is preferable to provide an image color correction unit that performs color correction of an image received by the image reception unit based on data.

  Application Example 8 In the image display device according to the application example, the image is displayed after the communication path is established by the communication establishment unit and before the input source is switched by the switching control unit. A standby state determination unit that determines whether or not the display device is in a standby state; and an activation unit that switches the image display device from a standby state to an on state when the standby state is determined by the standby state determination unit. It is preferable.

  Application Example 9 In the image display device according to the application example, the image display unit includes a light source, a light modulation element that modulates light emitted from the light source into image light based on the image signal, and The projector preferably includes a projection lens that projects the image light.

  Further, the present invention can be realized in various modes, for example, a method for realizing each part of the image signal supply device or the image display apparatus, a computer program for realizing each part, The present invention can be realized in the form of a recording medium that records a computer program, a data signal that includes the computer program and is embodied in a carrier wave, and the like.

  Application Example 10 An image display method in the image display system described in this application example is an image display method in an image display system in which an image based on an image signal supplied from an image signal supply device is displayed on the image display device. In the image display device, a step of preparing an image display unit that displays an image based on the image signal, and a step of preparing an input source switching unit that switches an input source of an image signal representing an image to be displayed on the image display unit And a step of preparing a communication establishment unit that establishes a communication path with the image signal supply device, and upon receipt of the establishment of the communication path by the communication establishment unit, the input source switching unit is controlled to control the input source switching unit. A step of switching the input source to the image signal supply device; and a step of receiving an image signal supplied from the image signal supply device. And the image signal supply device includes a step of transmitting the image signal to the image display device via the communication path after the input source is switched by the switching control unit. An image display method in an image display system.

1 is an explanatory diagram showing a schematic configuration of a projector system 100 as an embodiment of the present invention. 2 is an explanatory diagram showing an internal configuration of a projector 10 and a document camera 50. FIG. 4 is a flowchart showing connection-time processing executed by the control units 20 and 70 of the projector 10 and the document camera 50. 4 is an explanatory diagram showing an internal configuration of a projection unit 34 of the projector 10. FIG.

  Embodiments of the present invention will be described below based on examples with reference to the drawings.

1. Hardware configuration:
FIG. 1 is an explanatory diagram showing a schematic configuration of a projector system as an embodiment of the present invention. As illustrated, the projector system 100 includes a projector 10, four image input devices connected to the projector 10, that is, a document camera 50, a personal computer 90, a video tape recorder (VTR) 91, and a DVD. And a player 92. These image input devices provide an image input source to the projector 10. Here, the image may be either a still image or a moving image (that is, video). The document camera 50 acquires a video. The projector 10 selects a desired one from these input sources, and displays (projects) an image on the screen SC based on the selected input source.

  The document camera 50 includes a base 52, a placement surface 54, an arm 56, a camera head 58, an operation panel 60, and the like. The placement surface 54 is provided on the base 52, on which a subject T such as paper on which characters or pictures are drawn, or a three-dimensional object is placed. The arm 56 holds the camera head 58. The camera head 58 includes a lens, an LED, a photoelectric conversion element such as a CCD, and the like, and images the subject T placed on the placement surface 54. The operation panel 60 includes a plurality of buttons (button type switches), and inputs an operation command to the document camera 50 by the user.

  The arm 56 may be one that extends upward from the base 52 and is fixed, or may be configured to be foldable toward the base 52. By making it foldable, the document camera 50 can be put together in a compact manner. In use, the arm 56 is unfolded and the arm is unfolded.

  According to the document camera 50 having such a configuration, the subject T placed on the placement surface 54 is imaged, and an image signal indicating an image obtained by the imaging is output to the projector 10. The projector 10 and the document camera 50 are connected by USB via a USB cable 62. That is, the projector 10 and the document camera 50 are directly connected via the USB interface.

  FIG. 2 is an explanatory diagram showing the internal configuration of the projector 10 and the document camera 50. As shown in the figure, the projector 10 includes a control unit 20, a storage unit 22, an operation unit 24, a USB interface unit (USB I / F unit) 26, an input interface unit (input I / F unit) 28, an input source switching unit 30, An image processing unit 32 and a projection unit 34 are provided. A bus 36 connects the control unit 20 and the units 22 to 32 excluding the projection unit 34.

  The control unit 20 is configured by a CPU or the like, and operates according to a computer program stored in the storage unit 22 to control the units 22 to 32. The storage unit 22 stores image data and various computer programs. As various computer programs, a well-known USB module, a USB video class driver, an image display program, a connection processing program described later, and the like are stored.

  The operation unit 24 is for inputting an operation command from a user to the projector 10 and includes an operation panel (not shown), a remote control light receiving unit (not shown), and the like. The operation panel and the remote control are provided with an input source switching button (not shown) for switching the input source of an image displayed on the projector 10.

  The USB interface unit 26 is for exchanging control data, image data, and the like with an external device in accordance with a USB (Universal Serial Bus) standard. In this embodiment, the document camera 50 is connected to the USB interface unit 26.

  The input interface unit 28 is an interface for exchanging control data and image data with an external device other than USB, and includes an RGB interface, a video interface, an S-video interface, and the like here. A personal computer 90 is connected to the RGB interface, a VTR 91 is connected to the video interface, and a DVD player 92 is connected to the S-video interface.

  The input source switching unit 30 switches the input source of an image displayed on the projector 10 by selecting one interface from the USB interface unit 26 and each interface provided in the input interface unit 28.

  The image processing unit 32 generates display image data for image display based on image data or video data input from the interface selected by the input source switching unit 30. As shown in FIG. 4, the projection unit 34 includes a light source 342, a light modulation element 344 (344R, 344G, 344B), a projection lens 346, an illumination optical system 341, a color separation optical system 343, a relay optical system 345, and combining optics. A system 347 and the like are provided. Note that the projector 10 of this embodiment employs a transmissive liquid crystal panel as the light modulation element 344. White light emitted from the light source 342 is separated into red light, green light, and blue light via the illumination optical system 341, the color separation optical system 343, and the relay optical system 345, and the display generated by the image processing unit 32, respectively. After being light-modulated by the light modulation element 344 based on the image data for use, the light enters the combining optical system 347. The image light of each color modulated by the light modulation element 344 is synthesized by the synthesis optical system 347 and projected from the projection lens 346. The combining optical system 347 can be configured by a dichroic prism or the like.

  As shown in FIG. 2, the document camera 50 includes a control unit 70, a storage unit 72, an operation unit 74, a USB interface unit (USB I / F unit) 76, an illumination unit 78, an illumination control unit 80, an imaging unit 82, and an image. A processing unit 84 and a resolution conversion unit 86 are provided. A bus 88 connects between the control unit 70 and the units 72 to 76, 80, 84, 86 excluding the illumination unit 78 and the imaging unit 82.

  The control unit 70 is configured by a CPU, a DSP, and the like, operates according to a computer program stored in the storage unit 72, and controls each unit 70 to 86 included in the document camera 50. The storage unit 72 stores image data and various computer programs. As various computer programs, a well-known USB module, a USB class driver, a connection processing program described later, and the like are stored.

  The operation unit 74 is for inputting an operation command from a user to the document camera 50 and includes an operation panel 60 (FIG. 1) provided in the document camera 50.

  The USB interface unit 76 is for exchanging control data, image data, and the like with an external device in accordance with the USB standard. In this embodiment, the USB interface unit 76 is connected to the USB interface unit 26 of the projector 10. Both USB interface units 26 and 76 correspond to a “USB interface” which is a component of the present invention.

  The illumination unit 78 is a light source such as an LED that irradiates the subject T with light. The illumination control unit 80 controls on / off of the illumination unit 78 and the like. The imaging unit 82 includes a photoelectric conversion element such as a CCD, a drive unit that performs AE (automatic exposure) / AF (automatic focus) control, and the like. The imaging unit 82 is built in the camera head 58 (FIG. 1). The image processing unit 84 performs image processing such as white balance on the image signal indicating the image obtained by the imaging unit 82. The resolution conversion unit 86 converts the resolution of the image obtained by the imaging unit 82 to the resolution requested by the projector 10. The request from the projector 10 is sent from the projector 10 via the USB I / F unit 76.

  The document camera 50 is configured to be supplied with power from the projector 10 side via the USB interface unit 26.

  The projector 10 and the document camera 50 configured as described above operate as follows to display an image of the subject T (FIG. 1). That is, on the side of the document camera 50, when the control unit 70 receives an operation of the operation unit 74, the control unit 70 controls the illumination control unit 80, the image processing unit 84, and the resolution conversion unit 86, thereby placing the placement surface 54 (FIG. 1). The image of the subject T placed on () is imaged, and the image signal (image data) obtained by the imaging is temporarily stored in the storage unit 72. Thereafter, the control unit 70 transmits the image signal stored in the storage unit 72 to the projector 10 side via the USB I / F unit 76.

  On the projector 10 side, the control unit 20 receives an image signal sent from the document camera 50 via the USB I / F unit 26 and controls the image processing unit 32 to control the image signal based on the received image signal. Display image data. As a result, the projection unit 34 projects the projection light that is light-modulated based on the display image data. As a result, an image of the subject T is displayed on the screen SC (FIG. 1).

  As described above, the projector 10 includes various input sources in addition to the document camera 50. When receiving a user operation on an input source switching button (not shown) provided in the operation unit 24, the control unit 20 of the projector 10 activates the input source switching unit 30 and the USB interface unit 26. The input source of the image displayed on the projector 10 is switched by selecting one interface from the interfaces provided in the input interface unit 28.

  Further, in the present embodiment, when the document camera 50 is connected to the projector 10, the projector 10 automatically starts projecting an image captured by the document camera 50. Next, operations of the projector 10 and the document camera 50 when the projector 10 and the document camera 50 are connected will be described in detail.

2. Software configuration:
FIG. 3 is a flowchart showing connection-time processing executed by the control units 20 and 70 of the projector 10 and the document camera 50. In the drawing, the right side is a connection time process for the control unit 20 of the projector 10, and the left side is a connection time process for the control unit 70 of the document camera 50.

  When the process is started, each control unit (hereinafter also referred to as “projector control unit 20” or “document camera control unit 70”) 20 and 70 is first connected by USB between the projector 10 and the document camera 50. Processing for detecting a connection is performed (steps S110 and S210). This process detects that the USB interface unit 26 of the projector 10 and the USB interface unit 76 of the document camera 50 are connected using the USB cable 62. Although not shown, upon receiving this connection, power supply from the projector 10 to the document camera 50 via the USB cable 62 is started. In addition, each control part 20 and 70 waits for a connection detection to be performed, when a connection detection is not made.

  When the USB connection is detected, the control units 20 and 70 then perform configuration settings (steps S120 and S220). Specifically, the projector control unit 20 requests a configuration descriptor from the document camera 50, and the document camera control unit 70 returns the configuration descriptor to the projector 10 in response to the request. The projector control unit 20 acquires a configuration descriptor sent from the document camera 50.

  The descriptor includes a configuration descriptor indicating that the document camera 50 operates as a device conforming to the USB standard. The configuration descriptor includes a list of functions that the projector 10 can control with the function of the document camera 50, supported frame resolutions, supported frame formats (MJPEG / YUV), and color space types (sRGB). /BT.470-2(M)/BT.470-2(R,G)/SMPTE170M/SMPTE240M). Regarding the type of color space, a color space to be transferred within the document camera 50 is determined, and the determined color space is included in the configuration descriptor.

  The configuration settings in steps S120 and S220 are actually performed in the enumeration process that is started after the USB connection is detected. That is, in practice, enumeration processing according to the USB standard is performed, but only the configuration settings, which are the main components, are described in the flowchart shown in the figure.

  When the descriptor can be acquired normally, the projector control unit 20 loads the USB video class driver (step S130). Specifically, the USB video device class is detected from the device class information included in the descriptor, and the USB video class driver is loaded. The following processing is executed using the loaded USB video class driver as necessary.

  After execution of step S130, the projector control unit 20 determines whether or not the projector 10 is in a standby state (step S140). When the projector 10 is in a standby state, the projector 10 is turned on (step S150). . After execution of step S150, the process proceeds to step S160. If it is determined in step S140 that the device is not in a standby state, that is, in a power-on state, the process proceeds to step S160.

  In step S <b> 160, the projector control unit 20 determines whether the current input source of the projector 10, that is, the current source is the document camera 50. Here, when it is determined that the current source is not the document camera 50, a process of switching the input source of the projector 10 to the document camera 50 is performed (step S170). Specifically, the input source switching unit 30 is operated to switch the input source of the image displayed on the projector 10 to the document camera 50. Steps S160 and S170 correspond to a “switching control unit” that is a component of the present invention. After execution of step S170, the process proceeds to step S180. If it is determined in step S160 that the current source is the document camera 50, the process proceeds to step S180.

  In step S <b> 180, the projector control unit 20 performs a process of acquiring control parameters for the document camera 50. This process requests various control parameters from the document camera 50, and acquires various control parameters sent from the document camera 50 in response to the request. The control parameter is, for example, a setting range value (Min / Max) of a function (zoom, contrast adjustment, brightness adjustment, etc.) of the document camera 50 that can be controlled from the projector 10, a current setting value of the above function, or the like. These control parameters are used as needed by processing (not shown) on the projector 10 side.

  When the document camera control unit 70 receives a control parameter request from the projector control unit 20, the document camera control unit 70 transmits the control parameter to the projector 10 in response to the request (step S230).

  After executing step S180, the projector control unit 20 performs stream negotiation processing (step S190). The stream negotiation here is a process of setting the projector 10 based on the configuration descriptor acquired in step S120. The document camera control unit 70 similarly performs stream negotiation processing while exchanging with the projector control unit 20 (step S240). More specifically, the processing in steps S190 and S240 determines conditions for sending a stream (image data) such as frame resolution, frame format, interval, and bandwidth.

  After executing step S240, the document camera control unit 70 transmits the stream under the conditions determined in step S240 (step S250). After executing step S190, the projector control unit 20 requests the document camera 50 to transmit a stream, and receives the stream transmitted in step S250 (step S192). Thereafter, the projector control unit 20 performs a process of correcting the color of the image data that is the stream received in step S192, based on the type of color space included in the configuration descriptor acquired in step S120 (step S194). In other words, the projector control unit 20 operates the image processing unit 32 to generate display image data by performing color matching so that the target characteristics can be faithfully reproduced within the color gamut of the projector 10. In step S194, the target characteristic is set based on the type of color space acquired in step S180. As a result, the display image data is color-corrected so that it can be faithfully reproduced within the color gamut of the projector 10.

  Subsequently, the projector control unit 20 operates the projection unit 34 to execute the projection of the display image data generated in step S194 (step S196). Then, the projector control unit 20 ends this connection process. After executing step S250, the document camera control unit 70 ends the connection time process.

3. Action, effect:
In the projector system 100 of the present embodiment configured as described above, when communication via the USB interface is established between the document camera 50 and the projector 10, the projector 10 automatically sets the input source to the document camera 50. Switch. Thereafter, a stream is transmitted from the document camera 50, and the projector 10 receives the stream. Therefore, the user can easily display the image captured by the document camera 50 on the projector 10 only by connecting the projector 10 and the document camera 50 via USB.

  Further, in the projector system 100 according to the present embodiment, after the communication using the USB interface is established between the document camera 50 and the projector 10, the projector 10 is automatically turned on when the projector 10 is in the standby state. Switch to. Further, the projector 10 automatically switches the input source to the document camera 50. Therefore, it is ensured that the image captured by the document camera 50 is easily displayed on the projector 10.

  Furthermore, in this embodiment, since the projector 10 performs color correction based on the type of color space included in the configuration descriptor obtained by configuration setting, the image obtained by the document camera 50 is Then, color correction is performed so that it can be faithfully reproduced within the color gamut of the projector 10. Therefore, the color reproducibility in the projector 10 is excellent.

4). Variations:
The present invention is not limited to the above-described embodiments and modifications thereof, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

  (1) In the above embodiment, the document camera control parameters are acquired and transmitted (steps S180 and S230) in the connection process between the projector 10 and the document camera 50 constituting the projector system 100. May be omitted. In the above embodiment, the image color correction process is performed in step S194. However, the image color correction process may be omitted. Furthermore, the process of switching the input source to steps S160 and S170 to the document camera 50 may be configured to have moved immediately after step S180 or immediately after S190.

  (2) In the above embodiment, the document camera 50 is used as the image signal supply device. However, instead of this, another image signal supply device including an imaging unit, for example, a web camera, a digital still camera, a video camera, or the like. It is good also as a structure using.

  (3) In the above embodiment, the projector 10 in which the light modulation element 344 is configured by a transmissive liquid crystal panel is illustrated as an image display device. However, the light modulation element 344 is a reflection type liquid crystal panel or a micromirror device. It can also be configured. In the above embodiment, the invention has been described using the projector 10 that employs the three light modulation elements 344. However, the number of the light modulation elements 344 is not limited to three. For example, the illumination optical system 341 may be provided with a rotating color wheel, and one light modulation element 344 may be used to generate image light of each color in a time division manner. Furthermore, a configuration using four or more light modulation elements 344 is also possible.

  (4) In the above-described embodiment, the projector 10 that projects an image on the external screen SC is used as the image display device. Instead, a screen and a projector that projects an image on the back side of the screen are used. It is good also as a structure using the projection television provided. Furthermore, the image display device is not limited to a projector, and can be replaced with various image display devices such as various direct-view flat panel display devices.

  (5) In the above embodiment, the document camera 50 as the image signal supply device and the projector 10 as the image display device are connected by the USB cable 62. It can also be set as the structure connected via the radio | wireless.

  (6) In the above embodiment, a part of the configuration realized by hardware may be replaced with software. Conversely, a part of the configuration realized by software may be replaced by hardware. It may be.

DESCRIPTION OF SYMBOLS 10 ... Projector 20 ... Control part 22 ... Memory | storage part 24 ... Operation part 26 ... USB interface part 28 ... Input interface part 30 ... Input source switching part 32 ... Image processing part 34 ... Projection part 50 ... Document camera 52 ... Base 54 ... Mounting surface 56 ... Arm 58 ... Camera head 60 ... Operation panel 70 ... Control unit 72 ... Storage unit 74 ... Operation unit 76 ... USB interface unit 78 ... Illumination unit 80 ... Illumination control unit 82 ... Imaging unit 84 ... Image processing unit 86 ... Resolution converter 90 ... Personal computer 91 ... Video tape recorder 92 ... DVD player 100 ... Projector system 341 ... Illumination optical system 342 ... Light source 343 ... Color separation optical system 344R ... Red light modulation element 344G ... Green light modulation element 344B ... Blue light modulation element 345 ... Relay optical system 346 ... Projection lens 347 ... Composite optical system T ... Subject SC ... Screen

Claims (10)

In an image display system for displaying an image based on an image signal supplied from an image signal supply device on an image display device,
The image display device includes:
An image display unit for displaying an image based on the image signal;
An input source switching unit that switches an input source of an image signal representing an image to be displayed on the image display unit;
A communication establishment unit for establishing a communication path with the image signal supply device;
In response to the establishment of the communication path by the communication establishment unit, the switching control unit that controls the input source switching unit to switch the input source to the image signal supply device;
An image receiving unit for receiving an image signal supplied from the image signal supply device,
The image signal supply device includes:
An image display system comprising: an image transmission unit configured to transmit the image signal to the image display device via the communication path after the input source is switched by the switching control unit. The image display system according to claim 1,
The image signal supply device and the image display device each include a USB interface,
The communication establishment unit
A USB connection detection unit for detecting a connection with the image signal supply device via the USB interface;
A configuration setting unit for obtaining a configuration descriptor of the image signal supply device,
The image display device further includes:
An image display system comprising: a stream negotiation unit that determines a condition for transmitting and receiving the image based on a configuration descriptor acquired by the configuration setting unit. The image display system according to claim 2,
The configuration descriptor includes at least type data for defining a color space of an image obtained by the image signal supply device,
The image display device includes:
An image display system comprising an image color correction unit that performs color correction of an image received by the image reception unit based on the type data. The image display system according to any one of claims 1 to 3,
The image display device includes:
A standby state determination unit that determines whether or not the image display device is in a standby state before the input source is switched by the switching control unit after the communication path is established by the communication establishment unit; ,
An image display system comprising: an activation unit that switches the image display device from a standby state to an on state when a standby state is determined by the standby state determination unit. In an image display device that displays an image based on an image signal supplied from an image signal supply device,
An image display unit for displaying an image based on the image signal;
An input source switching unit that switches an input source of an image signal representing an image to be displayed on the image display unit;
A communication establishment unit for establishing a communication path with the image signal supply device;
In response to the establishment of the communication path by the communication establishment unit, the switching control unit that controls the input source switching unit to switch the input source to the image signal supply device;
An image display device comprising: an image receiving unit that receives an image signal supplied from the image signal supply device via the communication path. The image display device according to claim 5,
A USB interface connected to the image signal supply device;
The communication establishment unit
A USB connection detection unit for detecting a connection with the image signal supply device via the USB interface;
A configuration setting unit for obtaining a configuration descriptor of the image signal supply device,
further,
An image display device comprising: a stream negotiation unit for determining a condition for transmitting and receiving the image based on a configuration descriptor acquired by the configuration setting unit. The image display device according to claim 6,
The configuration descriptor includes at least type data for defining a color space of an image obtained by the image signal supply device,
An image display device comprising: an image color correction unit that performs color correction of an image received by the image reception unit based on the type data. The image display device according to claim 5,
A standby state determination unit that determines whether or not the image display device is in a standby state before the input source is switched by the switching control unit after the communication path is established by the communication establishment unit; ,
An image display device comprising: an activation unit that switches the image display device from a standby state to an on state when a standby state is determined by the standby state determination unit. The image display device according to claim 5,
The image display unit
A light source;
A light modulation element that modulates light emitted from a light source into image light based on the image signal;
An image display device comprising: a projection lens that projects the image light. An image display method in an image display system for causing an image display device to display an image based on an image signal supplied from an image signal supply device,
In the image display device,
Providing an image display unit for displaying an image based on the image signal;
Providing an input source switching unit for switching an input source of an image signal representing an image to be displayed on the image display unit;
Preparing a communication establishment unit for establishing a communication path with the image signal supply device;
In response to the establishment of the communication path by the communication establishment unit, controlling the input source switching unit to switch the input source to the image signal supply device;
Receiving an image signal supplied from the image signal supply device,
In the image signal supply device,
An image display method in an image display system, comprising: transmitting the image signal to the image display device via the communication path after the input source is switched by the switching control unit.

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